The Grad kit 4 contains a full set of the most popular warming colour / temperature correction graduated filter – Coral – in densities 1,2,and 3. Save over 21% compared with purchasing the filters separately. The Coral soft edge colour graduated effects filter is a pale pink colour. Coral Filters can be considered as both Colour Correction and Colour Effects Filters and are used to warm cool lighting situations such as overcast days. Soft edge grads have a smooth transition from clear to ND. Hard edge grads have a more defined hard lined transition and are usually used for longer focal lengths. Different graduated colour filters can be used in combination together or with solid colour or neutral density filters to give interesting bespoke effects. This 67mm filter kit is usable with Hitech 67mm holder systems or any 67mm (2.67") holder. The kit is also available in 85mm, 100mm, 150mm and 165mm sizes. Hitech filters are made from the highest quality 1.5mm optical resin.